Operating System (OS)
A critical region is

a program segment where shared resources are accessed
a program segment that often causes unexpected system crashes
none is the above
a program segment that has not been proved bug-free
one which is enclosed by a pair of P and V operations on semaphores

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Operating System (OS)
The term "operating system" means

a set of programs which controls computer working
the way a computer operator works
conversion of high level language into machine code
the way a floppy disk drive operates
None of these

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